+/*
+ * Below is the code for blinking the laptop LED along with hard
+ * disk activity.
+ */
+
+#ifdef CONFIG_BLK_DEV_IDE_PMAC_BLINK
+
+/* Set to 50ms minimum led-on time (also used to limit frequency
+ * of requests sent to the PMU
+ */
+#define PMU_HD_BLINK_TIME (HZ/50)
+
+static struct adb_request pmu_blink_on, pmu_blink_off;
+static spinlock_t pmu_blink_lock;
+static unsigned long pmu_blink_stoptime;
+static int pmu_blink_ledstate;
+static struct timer_list pmu_blink_timer;
+static int pmu_ide_blink_enabled;
+
+
+static void
+pmu_hd_blink_timeout(unsigned long data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pmu_blink_lock, flags);
+
+ /* We may have been triggered again in a racy way, check
+ * that we really want to switch it off
+ */
+ if (time_after(pmu_blink_stoptime, jiffies))
+ goto done;
+
+ /* Previous req. not complete, try 100ms more */
+ if (pmu_blink_off.complete == 0)
+ mod_timer(&pmu_blink_timer, jiffies + PMU_HD_BLINK_TIME);
+ else if (pmu_blink_ledstate) {
+ pmu_request(&pmu_blink_off, NULL, 4, 0xee, 4, 0, 0);
+ pmu_blink_ledstate = 0;
+ }
+done:
+ spin_unlock_irqrestore(&pmu_blink_lock, flags);
+}
+
+static void
+pmu_hd_kick_blink(void *data, int rw)
+{
+ unsigned long flags;
+
+ pmu_blink_stoptime = jiffies + PMU_HD_BLINK_TIME;
+ wmb();
+ mod_timer(&pmu_blink_timer, pmu_blink_stoptime);
+ /* Fast path when LED is already ON */
+ if (pmu_blink_ledstate == 1)
+ return;
+ spin_lock_irqsave(&pmu_blink_lock, flags);
+ if (pmu_blink_on.complete && !pmu_blink_ledstate) {
+ pmu_request(&pmu_blink_on, NULL, 4, 0xee, 4, 0, 1);
+ pmu_blink_ledstate = 1;
+ }
+ spin_unlock_irqrestore(&pmu_blink_lock, flags);
+}
+
+static int
+pmu_hd_blink_init(void)
+{
+ struct device_node *dt;
+ const char *model;
+
+ /* Currently, I only enable this feature on KeyLargo based laptops,
+ * older laptops may support it (at least heathrow/paddington) but
+ * I don't feel like loading those venerable old machines with so
+ * much additional interrupt & PMU activity...
+ */
+ if (pmu_get_model() != PMU_KEYLARGO_BASED)
+ return 0;
+
+ dt = of_find_node_by_path("/");
+ if (dt == NULL)
+ return 0;
+ model = (const char *)get_property(dt, "model", NULL);
+ if (model == NULL)
+ return 0;
+ if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
+ strncmp(model, "iBook", strlen("iBook")) != 0) {
+ of_node_put(dt);
+ return 0;
+ }
+ of_node_put(dt);
+
+ pmu_blink_on.complete = 1;
+ pmu_blink_off.complete = 1;
+ spin_lock_init(&pmu_blink_lock);
+ init_timer(&pmu_blink_timer);
+ pmu_blink_timer.function = pmu_hd_blink_timeout;
+
+ return 1;
+}
+
+#endif /* CONFIG_BLK_DEV_IDE_PMAC_BLINK */
+